Angle-cock device



@et 16, 1923. L47LH5 c. c. FARMER ANGLE COCK DEVICE Filed Nov. 29, 1919a Hifi f; II; l mmllh'lllll ATTORNEY Patented ct. 16, 1923.'

STATES PATENT OFFICE.

CLYDE C. FARMER, 0F EDGEWOOD, PENNSYLVANIA, ASSIGNOR TO THE WESTINGHOUSEAIR BRAKE COMPANY, 0F WILMERDING, PENNSYLVANIA, A CORPORATION OFPENNSYLVANIA.

ANGLE-COCK DEVICE.

Application filed November 29, 1919. Serial No. 341,448.

T 0 all whom t may concern."

Be it known that I, CLYDE C. FARMER, a citizen of the United Statesresiding at Edgewood in the county of Alleghen and State ofFennsylvania, have invente new and useful Improvements in Angle-'CockDevices, of which the following is a specification.

This invention relates more particularly to angle cock devices, such asare applied to the train brake pipe on railway vehicles.

rIhe principal object of the my invention is to lprovide improved meansfor maintaining t e plug valve of an an le cock device -seated againstpressure ten ing to unseat the valve.

In the accompanying drawing: Fig. 1 is a plan view of an angle cockdevice embodying my invention; Fig. 2 a part. section on the line 2-2 ofFig. 1; Fi 3 a section on the line 3--3 of Fig. 1;an Fig. 4 a section onthe line 4-4 of Fig. 1.

The angle cock shown in the drawing is of the locking handle typecomprising a cock body 1 containing a, tapered p ug valve 2 forcontrolling communication throu h a conduit 3, and adapted to beoperated y a handle 4, adapted to be locked in either the open orl theclosed position of the cock.

In order to provide means for maintain- Aing the valve 2 seated againstpressure tending to unseat the valve, the cock body 1 is formed with aortion 5 having a cavity 6 containing a bal check valve 7 adapted toseat in opposite directions.

Passages 8 and 9, communicating with cavity 6 at opposite sides of thevalve 7, lead to the conduit 3 at opposite sides of the plug valve 2,and a passagee 10, leads from cavity 6 to the space low the plug valve2. i

In the manipulation of the plug valve 2 between its open and closedpositions, the fluid pressure in conduit 3 will often be higherl at oneside than at the other side of the valve 2 and if such is the case thehigher pressure will shift the valve 7 to seat against the lowerpressure, so that fluid Iat the higher pressure can then flow past thevalve' 7 to passage 10 and thence to the space below the plug valve 2.

It will thus be seen, that if the plug 4valve 2 is in its closedosition, the higher pressure on one side or the other of the valve 2will be present in the space below the valve 2, so that there willalways be ample pressure to hold the plug valve to its seat.

In the construction shown, there is also provided a valve for ventingfluid from the conduit 3, when the plug valve 2 is turned to its closedposition, a similar valve being disclosed in my prior pendingapplication, Seriall No. 330,788, filed October 15, 1919.

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As shown, a vent valve 11 is provided,

having an operating stem 12 which is adapted to be engaged by a camportion 13, upon turning the cock handle 4 to its closed position.According to the present improvement, the cam portion 13 forms part of aring 14 which is loosely mounted over the stem section 15 of the plugvalve 2.

'I he ring 14 is provided with a slot in which a downwardly projectingfinger 16 of the member 17 engages and since the member 17 is mounted onthe squared portion of the plug valve 2 and moves with the plu valve,the ring 14 will also move with sai valve.

The cam portion 13 of the ring 14 bears upwardly against a surfaceformed in the vent valve section 18 of the casting 1.

When the plug valve 2 is turned to its closed postion, fluid is ventedfrom the car side` of the conduit 3, 'through port 19 in the valve 2,cavity 20, port 21, which registers with passage 22, and thence past thevalve 11 to exhaustport 23. l

By the above construction, since the cam portion 13 is maintained ina'xed relation to the end of the stem 12 by means of the bearingengagement in the portion 18, the wear of the plug valve 2 will notaffect the position of the cam portion, so that the lift of the valve 11will remain constant, when the cock is turned.

Having now described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. A cock. comprising a body member having a fluid conduit, a plug valvefor controlling communication through s'aid conduit, and means subjectto the opposing fluid pressures in the conduit at opposite sides of theplug valve and operated byv a difference in said pressures for supplyingfluid at the higher pressure to one end of the plug valve, to therebymaintain` said valve seated.

2. A cock comprising a body member having a fluid conduit, a plug valvefor controlling communication through -said conduit, and a check valveadapted to seat in opposite directions and subject to the opposing luidpressures in the conduit at opposite sides of the plug valve forsupplying fluid under pressure from said conduit to one end of the plugvalve, to therebym'aintain said valve seated.

3. A cock com rising a body member having a fluid con uit, a plug valvefor controlling communication through said conduit, and means having oneposition for opening communication from said conduit at one side of theplug valve and another position for opening communication from theconduit at the other side of the plug valve for controlling a fluidpressure conduit, of a-Valve for venting Huid from said conduit in theclosed position of the plug valve, a stem for operating the vent valve,a member mounted on and rotatable With said plug valve and having a camsurface for engaging said stem, said member being adapted to engage abearing surface in the body member for resisting pressure exerted by thevalve stem. l

In testimony whereof I have hereunto set m hand.

y CLYDE C. FARMER.

